Asia's benchmark regional stock index swung between gains and losses as Australian banks declined and the yen rose after Bank of Japan Governor Haruhiko Kuroda said the central bank had announced sufficient stimulus.

Nikkei 225 14,612.45 +128.47 +0.89%

S&P/ASX 200 4,983.5 -78.95 -1.56%

Shanghai Composite 2,288.53 +12.87 +0.57%

Commonwealth Bank of Australia, the country's largest lender, fell 1.6 percent, as Australian banks headed for the largest weekly drop in a year.

Lenovo Group Ltd. added 4.3 percent in Hong Kong after the second-biggest personal computer maker said it sees no limit to size of acquisitions to bolster its smartphone business.

Tokyo Electric Power Co. led Japanese utilities to the biggest advance on Japan's Topix Index, as the gauge rebounded from a plunge that yesterday wiped $314 billion from the values of the country's shares.